Resistance of Evergreen Hybrid Azaleas to Root Rot Caused by Phytophthora cinnamomi. D. M. Benson, Associate Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27607. F. D. Cochran, Professor Emeritus, Department of Horticultural Science, North Carolina State University, Raleigh 27607. Plant Dis. 64:214-215. Accepted for publication 3 October 1979. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-214.

Of 73 evergreen azalea cultivars in 10 hybrid groups evaluated for resistance to root rot caused by Phytophthora cinnamomi, 20 were rated resistant, 25 were rated moderately resistant, and 28 had severe root rot. The hybrid groups, in order of increasing susceptibility, were Indian, Rutherford, Pericat, Glenn Dale, Whitewater, Satsuki, Back Acres, Gable, Kurume, and NCSU.